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Photocatalyst using reducing organic compound

A technology of photocatalysts and organic substances, applied in organic compound/hydride/coordination complex catalysts, chemicals for biological control, physical/chemical process catalysts, etc., can solve limited applicable occasions, difficult processing technology, oxidation Titanium safety doubts and other issues, to achieve the effect of high safety

Inactive Publication Date: 2016-06-08
NAT AGRI & FOOD RES ORG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since titanium oxide does not show photocatalytic activity in visible light of 400nm or more, it cannot be used for sterilization-decomposition in living spaces where only visible light such as fluorescent lamps can be used, and there is a problem of limited application.
[0007] In addition, in order to realize the photocatalytic activity in visible light, although the technology of mixing impurities (doping) has been tried (see, for example, Patent Documents 1 and 2, etc.), the processing technology is difficult and there is a problem that the price is very high.
Furthermore, due to the very weak activity of photocatalysts manufactured by doping technology, there is no practical situation
[0008] In addition, in the United States, since titanium oxide is a substance recognized as a cancer-causing substance, the safety of titanium oxide itself is doubted, and the occasions where titanium oxide can be used are greatly limited.

Method used

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  • Photocatalyst using reducing organic compound
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  • Photocatalyst using reducing organic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] [Example 1: "Raw materials containing reducing organic matter"]

[0147] By verifying whether there is activity of reducing ferric iron to ferrous iron, it can be judged whether various raw materials are reducing organic matter.

[0148] 【(1) "Verification of Iron Reducing Ability"】

[0149] For each 100 parts by weight (dry weight conversion) of each raw material shown in Table 1, prepare each aqueous solution (0.1wt% each raw material, 0.1wt% ferric chloride solution) and allowed to stand at room temperature for a few minutes. Thereafter, 2 g / L of bipyridyl groups and 100 g / L of acetic acid were added and mixed to each aqueous solution, and the presence or absence of a color reaction was examined. Among them, the bipyridyl group is a substance that remains colorless without reacting with trivalent iron, but turns red when it reacts with divalent iron. Used in the detection of ferrous iron. In addition, as a control, a 0.1 wt% iron (III) chloride aqueous solution w...

Embodiment 2

[0157] [Example 2: "Wavelength for Exciting Photocatalyst Activity"]

[0158] The 'reaction product of reducing organic matter and iron' was prepared using tea or coffee grounds as a raw material, and the photocatalytic activity of the material was investigated.

[0159] 【(1) "Measurement of photocatalyst activity"】

[0160] Mix 4 parts by weight of ferric chloride in terms of iron element with respect to 100 parts by weight (dry weight conversion) of tea grounds (residue of hot water extraction of tea leaves) or coffee grounds (residue of hot water extraction of ground roasted coffee beans) (III)(FeCl 3 ), add water twice the weight of the total amount of the two, and heat-treat at 98° C. for 1 hour to obtain a reaction product. The filtrates obtained by filtration were respectively referred to as "tea leaf component-iron" (sample 2-1) or "roasted coffee bean component-iron" (sample 2-2). In addition, as a comparative sample, titanium oxide (TiO 2 : titanium (IV) oxide an...

Embodiment 3

[0178] [Example 3: "Discussion with various reducing organic substances"]

[0179] When preparing reaction products of various reducing organic substances and iron, whether or not photocatalytic activity can be confirmed is also examined.

[0180] 【(1) "Measurement of photocatalyst activity"】

[0181] 4 parts by weight of iron (III) chloride in terms of iron element were mixed with 100 parts by weight (dry weight conversion) of each of ascorbic acid, grape polyphenols, catechin, chlorogenic acid, caffeic acid, tannin, or furfur vinegar solution (FeCl 3 ), add water twice the weight of the total amount of the two, and heat-treat at 98° C. for 1 hour to obtain the reaction products shown in Table 3 (samples 3-1 to 3-7). In addition, as a comparative sample, titanium oxide (TiO 2 : titanium (IV) oxide anatase type, particle size 100 to 300 nm, manufactured by WAKO) (comparison 3-1).

[0182] Next, a plurality of 3.5 ppm basic fuchsin aqueous solutions were prepared to add eac...

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Abstract

The purpose of the present invention is to inexpensively provide a photocatalyst, which is a photocatalyst that can be used in organic material decomposition or sterilization, is not limited in utilization situations, and is highly safe, and which exhibits activity by absorbing light of a wide range of wavelengths including visible light. Provided are: a photocatalyst formed by mixing reducing organic compound having iron reducing capability and an iron supplying raw material in the presence of water and the reaction product obtained as the active ingredient, specifically, a photocatalyst exhibiting photocatalytic activity when irradiated with light of wavelengths among ultraviolet rays, visible light, or infrared light,an organic material decomposition method characterized by bringing the photocatalyst and material to be decomposed into contact and irradiating the same with light of wavelengths among ultraviolet rays, visible light, and infrared rays,and a sterilization method characterized by bringing the photocatalyst and material to be sterilized into contact and irradiating the same with light of wavelengths among ultraviolet rays, visible light, or infrared rays.

Description

【Technical field】 [0001] The present invention relates to a technology related to a photocatalyst using a reaction product of a reducing organic substance having iron reducing ability and iron. In addition, the present invention is a technique related to a method for decomposing organic matter or a method for sterilizing a photocatalyst. 【Background technique】 [0002] 【Conventional photocatalyst technology】 [0003] Since photocatalysts can be used for decomposition, sterilization, and the like of organic harmful substances only by receiving light, social demands are increasing as a technology that is convenient and highly usable. [0004] As substances exhibiting photocatalytic activity, metal compounds such as tungsten, indium, vanadium, silver, molybdenum, zinc, gallium phosphide, gallium, and arsenic are known in addition to titanium oxide, but these are only ultraviolet light below 400 nm. The wavelength shows the photocatalytic activity of the substance. Among them...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02A01N55/02A01P1/00A61L2/08A61L2/16B01D53/86B01J31/04B01J37/03B01J37/04
CPCA01N43/16A61L2/08A61L2/16B01D53/86A61L2/084A61L2/085A61L2/10B01J37/16B01J27/128B01J35/04C02F2305/10C02F1/30C02F1/32C02F1/705C02F2303/04Y02W10/37C02F2101/363C02F2101/366B01J2531/0272B01J31/223B01J31/0202B01J31/0209B01J2531/0269B01J2531/842B01J31/061B01J23/745B01J31/04B01J35/004A61L2/088A61L2/26A62D3/17A62D3/176A62D2101/20B01J31/02B01J31/0204B01J31/06B01J2231/005B01J2531/005
Inventor 克劳迪欧·森川健治筱原信
Owner NAT AGRI & FOOD RES ORG
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